MMP8 and pachyonychia congenita: Our study found that MMP‐8 levels were significantly higher among PC patients undergoing ADT who may have lower polymorphonuclear leukocyte chemotaxis, higher levels of collagenase and elastase, and lower amount of collagen synthesis by fibroblasts, all of which contribute to periodontal degradation (Yucel‐Lindberg & Båge, 2013).